Multiple choice

Nitrogen gas makes up ___% of our atmosphere.

  1. 78

  2. 21

  3. 0.1

  4. 0.03
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A Correct answer
Explanation

Earth's atmosphere consists of approximately 78% nitrogen gas (N2), making it the most abundant atmospheric gas. This high percentage is crucial because nitrogen is essential for life, but most organisms cannot directly use atmospheric nitrogen in this form. The remaining atmosphere is primarily oxygen (21%), argon (0.9%), and trace gases including carbon dioxide (0.03%).

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